Upstream waves simultaneously observed by ISEE and UKS

Details Upstream waves simultaneously observed by ISEE and UKS Upstream waves simultaneously observed by ISEE and UKS

Jul 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....92.7354r&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 92, July 1, 1987, p. 7354-7362.

Physics

21

International Sun Earth Explorer 2, Shock Wave Interaction, Solar Wind, Uk Satellites, Upstream, Bow Waves, Electromagnetic Interactions, Extremely Low Radio Frequencies, Field Strength, Magnetic Field Configurations

Scientific paper

Measurements obtained in the solar wind by ISEE-2 and the United Kingdom Subsatellite (UKS) have been examined for observations of upstream waves. These data reveal that the waves in the foreshock region are enhanced at all frequencies from at least 0.003 Hz to 0.5 Hz. The wave spectra generally have a spectral peak, but this peak is usually broad and the peak frequency depends on the position of the spacecraft. Generally, the spectra seen at the two spacecraft are most similar at high frequencies and least similar at low frequencies. The geometry of the interaction is displayed in the plane containing the magnetic field, the solar wind velocity, and the spacecraft location. However, this coordinate system does not order all the observed wave properties. It does not clearly explain or order the handedness of the waves, or their direction of propagation. It is clear that the upstream region is inherently three-dimensional. The position-dependent nature of the upstream waves indicates that comparisons between ground-based measurements and in-situ observations must be undertaken with some caution.

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